core graphics - iPhone - CGPoint distance in pixels and screen resolution -

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i have code - (void)drawmaprect:(mkmaprect)maprect zoomscale:(mkzoomscale)zoomscale incontext:(cgcontextref)context method (into mkoverlayview subclass) prevent drawing segments less 10 pixels long on map overlay :

            cgpoint origin = [self pointformappoint:poly.points[0]];             cgpoint lastpoint = origin;              cgcontextmovetopoint(context, origin.x, origin.y);              (int i=1; i<poly.pointcount; i++) {                 cgpoint point = [self pointformappoint:poly.points[i]];                  cgfloat xdist = (point.x - lastpoint.x);                 cgfloat ydist = (point.y - lastpoint.y);                 cgfloat distance = sqrt((xdist * xdist) + (ydist * ydist)) * zoomscale;                  if (distance >= 10.0) {                     lastpoint = point;                     cgcontextaddlinetopoint(context, point.x, point.y);                 }             }

will test >= 10.0 take care screen resolution, or may introduce [uiscreen mainscreen].scale parameter ?

i believe test >= 10.0 not take account screen resolution. apple of drawing arithmetic using "points" instead of pixels- way code not have change retina display compared normal display.

if want draw 10.0 pixels wide, need take account screen resolution; however, if you'll have write method support both retina display , normal display.


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